我们这就来看看这些表的结构吧: PFQuery *query =[PFQuery queryWithClassName:@"ParseClassName"]; [queryfindObjectsInBackgroundWithBlock 一个十分危险的漏洞是攻击者可任意修改聊天内容: PFQuery *query = [PFQuery queryWithClassName:@"ChatMessage"]; [query whereKey